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European Journal of Echocardiography Advance Access originally published online on November 6, 2008
European Journal of Echocardiography 2009 10(3):406-413; doi:10.1093/ejechocard/jen298
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Published on behalf of the European Society of Cardiology. All rights reserved. © The Author 2008. For permissions please email: journals.permissions@oxfordjournals.org.

Comparison between colour-coded and spectral tissue Doppler measurements of systolic and diastolic myocardial velocities: effect of temporal filtering and offline gain setting

Aristomenis Manouras1,*, Kambiz Shahgaldi1, Reidar Winter1, Jacek Nowak1 and Lars-Åke Brodin2

1 Department of Clinical Physiology, Karolinska University Hospital Huddinge, SE-141 86 Stockholm, Sweden
2 School of Technology and Health, Royal Institute of Technology, Flemingsberg, Stockholm, Sweden

Received 11 July 2008; accepted after revision 5 October 2008; online publish-ahead-of-print 6 November 2008.

* Corresponding author. Tel: +46 8 5858 8679; fax: +46 8 774 8082.E-mail address: aristomenis.manouras{at}karolinska.se


  Abstract

Aims: Colour tissue Doppler (TD) has been reported to underestimate the longitudinal myocardial motion velocities measured with spectral TD. This study evaluates the effect of temporal smoothing and offline gain settings on the results of velocity measurements with these two methods and the difference between them.

Methods and results: In 57 patients, 2D data and left ventricular velocity profiles were acquired using spectral and colour TD for a subsequent offline analysis. Longitudinal myocardial velocities were measured at unsaturated, 50%-saturated and fully saturated gain, and before and after temporal smoothing using 30, 50, and 70 ms filters, respectively. Gain level and filter width altered significantly the measured velocities. Peak systolic and early diastolic velocities were significantly higher (P < 0.001) and E/E' ratio was significantly lower (P < 0.001) with spectral TD than with colour TD, although there was a good correlation between the results of both TD modalities. The differences between the methods increased at increasing filter width and gain level.

Conclusion: Despite good correlation of the results, spectral TD produces significantly higher myocardial velocity values and lower E/E' ratio than colour TD modality. Increasing gain and temporal smoothing alter significantly the results of velocity measurements and accentuate the difference between the two TD methods.

Keywords: Spectral Doppler; Colour Doppler; Temporal filtering; Offline gain; Myocardial velocity


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